1, the new car run-in. There may be a running-in period for a new car's brake disc that may have just been changed. In the running-in period, there will be some abnormal sounds that will usually disappear after a few hundred kilometers.

2. The normal launch of the ABS system. When the brakes are braked, there will be a series of “beep” sounds, and sometimes there will be the appearance of pinching the feet. This shows that the ABS system is started, is a normal sound, and the brakes can be stepped on at the moment, but only There are ABS system vehicles.

3, the brake pads show a hard metal point, there will be some fine metal particles inside the brake pads, light step on the brakes will announce a sharp and sharp sound, this question can slam on foot brakes or brake pads removed and polished from scratch, Can replace very good brake pads.

4, brake pads wear serious, start an alarm. Brake pads usually have alarm pads. When the brake pads wear to the limit, the alarm pads will have a conflict with the brake discs and a sharp metal conflict sounds. The brake pads must be replaced in time to avoid scratching the brake discs and braking failure. .

5, brake disc wear and tear. The wear of the brake disc will form a relatively deep groove in one circle of the disc, and abnormal noise may occur in the marginal conflict between the brake pad and the groove. If the groove is not particularly deep, it can be handled by grinding the brake pads to avoid the conflict between the brake pads and the edge of the groove. If the groove is already deep, the replacement of the brake disk is advocated. It is generally advisable to replace the brake pads with one brake disc.